Power-transmitting mechanism



.D. G. ROOS. POWER TRANSMITTING MECHANISM.

Patented July 6, 1920. I

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Invenib r Zmar APPLICATION HLED M'AY5,1919- G.ROOS,

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POWER TRANSMITTING MECHANISM.

APPLICATION man MAY 5, 1919.

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POWER TRANSMITTING MECHANISM.

APPLICATION FILED MAY 5. ms. 1,345,462. Patented J 3 6, 1920.

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3;! M Ne da n. G. R008. POWER TRANSMITTING MECHANISM.

' AP PLICATHJN FILED MAY 5, 1,919. 1,345,462. Patented July 6, 1920.

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, UNITED STATES PATENT oFFicE.

DELMAB! G. ROOS, OF BBIDGEPOBT, CONNECTICUT, ASSIGNOR TO THE LOCOMOBILE COMPANY OF AMERICA, OF BRIDGEIORT,

CONNECTICUT, A CORPORATION OF WEST VIRGINIA.

. POWER-TRANSMITTING MECHANISM.

T0 albwhom it may concern: Be it known thatI, DELMAR G. Roos, a citizen of the United States, and a resident of Bridgeport, county of Fairfield, and State of Connecticut, have invented an Im-- provement in Power-Transmitting echanisms, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.

This invention relates to power transmitconcerned with a selective type transmission trated therein,'I-have selected for exempli- ,p

' a driven shaft 11, and a countersha mounted in a usual manner larged gear set of the class commonly employed in motor vehicles to secure different gear ratios between the internal combustion engine an the driving wheels of the vehicle, although the invention is by no means class of work, but is capable of very general application.

My invention will be best understood by reference to the following description, when taken in connection with the accompanying drawings of one specific embodiment thereof selected for exemplification, while its scope will be more particularly'pointed out in the appended claims.

In the drawings: .Figure 1 is a front vertical cross-section, of a power transmitting mechanism exemplifying my invention;

Fig. 2 is 22 of Fig. 1;

ig. 3 is a plan section on line 3-3 of Fig. 4 is a detail sectional'view on an enscale on line 44 of Fig. 3;

Fig. 5 is a detail plan section online 5-5 of Fig. 2; and 1 Figs.-. 6 to 10,- inclusive, are detail plan sections on an enlarged scale, illustrating the action of the interlocking device invarrious positions of the gearshiftingbars. Referring to the drawings, and to the embodiment of my invention which is illusfication what is known as a ,four forward speed and reverse transmission gear set, comprising a driving shaft 10 (see F1 3),

12, a gear case 13. Formed on, or secured to, the driving shaft 10 is a driving pinion 14, which constantly meshes with and drives a. gear 15,-

Specification of Letters Patent.

' and meshing with on the driven shaft '11. The fourth speed is limited 'to' this elevation, partly a vertical sectional view on line .with jaws 36, 37 and 38,e

'41, operating in a gate-42. This Patented July 6,1920.

919. Serial N0, 294,719.

the latter being secured to the countershaft 12. The first speed is secured by a pinion 16 formed on or secured to the countershaft 12, and adapted to mesh with a sliding gear 17 splined on the driven shaft 11. The second speed is obtained by the use of a gear 18, formed on or secured to the countershaft 12, and adapted to mesh with a sliding gear 19 splined on the driven shaft 11. The third speed is obtained by the use of a gear 20, formed on or secured to the countershaft12, a sliding gear 21 splined secured by providing a clutch in the form of an internal gear 22, formed within the gear 21, and adapted to mesh-with the driving pinion 14. Under'these circumstances, the

driving and driven shafts are directly coupled together, and what is known as direct drive is obtained. Reverse is obtained by the use of a gear 23, formed on or secured to the countershaft 12, and'adapted to mesh with an intermediate gear 24 (best shown in Fig. 2), the latter in turn being adapted to mesh with the gear 17.

As a means for shifting the gears to secure the four forward speeds and reverse, there are provided three gear-shifting forks 25, 26 and 27, carried respectively by gearshifting bars 28, 29 and 30. The gears 17 and 19 constitute a unit provided with an 1 annular groove 31, which receives the fork 25. The hub ,of the gear 21 is provided with a similar fork 26, while the hub of the gear 24 is provided with an annular groove 33, to receive the fork 27. The bars 28,29 and 30 are mounted to slide lengthwise in suitable guides 34 and 35, secured to the; gear case 13, and said bars are provid d respectively a h of which is adaptedto receive'the free end of a de-' pending arm 39 (see Fig. 2), the latter be ing secured to an axially movable shaft 40. To the latter is secured a gear shifting lever ate is rovided with ant/irregularly shape opening (see. Fig. 5.), v verse slot 43, corresponding to the neutral position of the lever 41, and provided'with longitudinal bra nchslots 44, 45', 46, 47 and 48, corresponding, respectively, to the posi-, tions occupied by obtaining first, verse gear ipositions.

It should here be annular groove 32 to receive 'the comprising 'amain transthe gear-shifting lever in I second, third, fourth and r'e-' noted that the branch slot 48 is distinct gear is avoided.

from the other branch slots, and that reverse is obtained through the use of the third gear-shifting bar distinct from those by means of which the forward speeds are obtained. This is to obviate the possibility of accidental engagement with the intermediate reverse gear, which sometimes occurs when only two bars and two sets of branch slots are employed. By providing the slot 48 for the reverse position of the lever, the danger of accidentally engaging the reverse It has been stated that the transmission is of the selective type. This means that.

any one of the gear ratios may be availed of without passing through another, or 111 other words, anyratio may be selected at will independently of the others. A common and well-known way of accomplishing thisv is by the use of aplurality of gear shifting bars, provided respectively with jaws any one of which may be engaged and i moved by the gear-shifting lever, as is the case in the described construction. This necessarily involves the idea of a neutralposition, to which each. gear-shifting bar should be brought, and in which it should remain while one of the bars is longitudinally displaced. This neutral position is represented in F igs. 2 and 3, in which each of the bars is in neutral position, as is also the gear-shifting lever.

It is customary toplace a transmission of this,cla-ss with the axes of the gears-extending lengthwise of'the motor vehicle. Now placed, the gears are likely to be accidentally shifted it must be evident that when so by the forward or rearward movement of the vehicle, owing to the inertia of the gears.

This sometimes happen's when the vehicle suddenly starts or stops. When this occurs,

there is serious 'danger'of theteeth of the gears being stripped. As a means to prevent such acciden'tal shifting of the gears, I have provided the-interlocking means which I shall now describe.

In the presentexa nple, I have shown two members 49 and 50, interposed respectively bar 28- and the eral depressions 51 and 52, a apted to receive the members 49 and into the depressions 53 an p 50, respectively, and the outeribars 29 and '30 areprovided are moved laterally in o ,posite directions .54, respectively; e

. anduwhen, on the other hand, either of t outer rods 29 and 30 is moved lengthwise,

such rod moves the adjacent member laterally into the adjacent depression in. the intermediate rod, and in addition acts through such member to move the remaining rod laterallyinto the depression of the other outer rod.

To this end, the locking members 49 and 50 herein are formed as separate pieces carried by suitable swinging means normally engaging each other laterally. One convenient way of accomplishing this is by making the ends of the members 49- and 50 reduced, and suitably secured as by riveting, in upper and lower pairs of arms 55 and 56. pivoted on bolts 57 and 58 on the guide 35, as shown in Figs. 3 and 4. Thus the members 49 and 50 are swingingly mounted in such manner as to secure smooth mechanical action, and without being mere floating members. Lateral engagement between the two swinging parts may be effected conveniently by providing the arms 55 and 56 with lateral projections 59 and 60, normally 'engaging each other laterally, as clearly approximately eq'uallto the distance between two adjacent bars, plus the depth of one of bars, as illustrated in Fig. 6. This is theposition which the parts will assume when the gear-shifting lever is moved fromits neutral position into the slot 44, to obtain the first speed. When this occurs, the outer bars 29' and 30 are positively locked against;

endwise' displacement, and hence the; gears whose movements they control are locked against axial movement.- So, also, when the intermediate bar is moved le hwise in the opposite direction to' the position illustrated The diameterof each of the members149 and 50 is herein intermediate 'bar- 28 111 F ig. 7, the locking members 49 and 50 will be moved laterally into the depresions 53 and 54, thus locking the outer bars 29 and 30 againstlengt'hmse movement. This 1s. the position which theparts will assume when the gear-shifting lever is moved from its neutral the second. speed. ou'ter bars 29 and against endwise di'splacement, and hence the gears whose movements they control. are locked against axialmovement.

* When this occurs, the

position into the slot 45 to obtain 3.0 are positively locked humid int Similarly, when the gear-shifting lever is moved into the slot 46 to obtain the third speed, the bar 29 will be moved, lengthwise into the position shown in Fi 8, whereupon the locking members 49 and 50 will be moved laterally in entering the depression 51 in the intermediate bar 28, and the other entering the depression 54 in the bar 80,. It follows that when this occurs, the bars 28 and will be positively locked against lengthwise movement, and hence the gears which they control will be locked against axial movement. Likewise, whenthe' gear-shifting lever is o the slot 47 to obtain the fourth speed, the bar 29 will be moved lengthwise into the position shown in Fig. 9, whereupon the locking members 49 and 50 will be moved laterally, one entering the depression 51 in the intermediate bar 28, and the other entering the depression 54 in the bar 30. It follows that when this, occurs, the bars 28 and 30 will again be positively locked against lengthwise displacement, and hence the gears which they control will be locked against axial movement.

When the gear-shifting lever into the slot 48 to obtain reverse, the bar 30 will be moved lengthwise into the position shown in Fig. 10, whereupon the locking members 49 and 50 will be'moved laterally one entering'the depression 52 in the intermediate bar 28, and the other entering the I depression .53 in the bar 29; It follows that when this occurs. the bars 28 and 29 will be positively locked against lengthwise movement, and hence the gears which they control will be locked against axial movement.

It should now be apparent that I have provided a thoroughly reliabl e and positive means for locking the gears against-accidental shifting, while still preserving the advantages to be derived from the use of the isolatedv slot to receive the lever in its reverse position. t should also be evident that this is accomplished with a -1 minimum of parts, and the utmost simplicity.

The gear-shifting bars may be, and are herein, provided with usual means yieldingly to position them in definite ositions with relation to thepositions of t e gears which they control.' One well-known way of accomplishing this is to provide for each rod a spring-pressed pin exemp 'fied by a pin- 61 in Fig.2, coiiperating with. series- 62 in the rod, the location of depressions of these depressions corresponding to the different positions which the rod assumes. When the rod is moved lengthwise, the

-,spring-pressed pin' yields and allows the rod to be shifted, and when the rod reaches its next position, sald pin enters the next depression and acts as a detent to hold the rod in such position. It should be understood,

however,

the same direction, one

my invention,

is moved- Igear-shifting plurality of gears a operating said. gear that these spring-pressed pins are insufficient to prevent accidental shifting of the gears under the circumstances hereinbefore described, and that the described interlockin means are essential to serve as a safeguar Having thus described one embodiment of but without limiting myself thereto, what, I claim and desire by Letters Patent to secure is 1. In a power-transmitting mechanism, the combination'of a gear set comprising a plurality of gears affording four forward speeds and reverse, means for operating said gear set, including three sliding rods, and swinging means operated by any one of said rods upon lengthwise movement thereof to lock the remaining against lengthwise movement 2. In a four forward speed and reverse transmission of the selective type, the com changes, said means including three sliding rods, and swinging interlocking means operated by any one v wise movement thereof to interlock with the remaining two rods to hold the same against lengthwise movement. 7

3. In a power-transmitting mechanism, the combination of a figear set comprising a plurality of gears a speeds and reverse, means for selectively operating said gear set, including three sliding rods, and means operated by any one of said rods upon lengthwise movement to lock the remainingtwo rods against lengthwise movement, the last mentioned means including two swinging members interposed between the intermediate other rods.

4. In a power-transmitting mechanism, the combination of a ear set comprising a ording four forward speeds and reverse, means for selectively operating said gear set, including three sliding rods'comprising two outer rods each provided with a depression and an intermediate rod provide with two depressions, and means operated by any one of said rods upon lengthwise movement thereof to enter de ressions of the "remaining two rods -to ho d the same against lengthwise movement,

ording four forward rod and the two two rods of said rods upon lengththe last-mentioned means comprising two cooperating swinging members.

apluralityof gears affording four forward speeds and reverse, means for selectively set, including three-sliding rods comprising diate rod provided Wllih JWO depressions,

two outer rods each provided with adepression and an:1nterme-" and means operated by any one of said rods upon lengthwise movement thereof to enter vdepressions of the remaining two rods to hold the same against lengthwise movement,

, thelast -mentioned means comprising two members interposed, respectively, between said intermediate rod and said outer rods,

and swinging arms carrying said members,

rods, respectively.

In a power-transmitting mechanism, the combination of a gear set comprising a plurality of gears affording four forward speeds and reverse, means for selectively operating said gear set, including three sliding rods comprising two outer rods each arms to move the other provided with a de ression and an intermediate rod provide with two depressions, and means operated by any one of said rods upon lengthwise movement thereof to enter depressions of the remaining two rods to hold thesame against lengthwisemove-r ment, the last-mentioned means comprising two members interposed,- respectivel between said intermediate'and outer rod: and two airs of swinging arms carrying said mem rs and normally engaging each other, each of said members, when moved by one of said, outer rods, causing its pair of arms to act through he other pair 01" in the same direction, and said members,

when moved laterally-in opposite directions by said intermediate rod, causing one pair of arms to separate from the other.

In testimony. whereof I have signed my name to this specification.

ELMAR G. ROOS.

ember laterally 

